Some people think that sudoku requires solvers to be able to do very complex things to solve puzzles. However the easy ones can be solved by almost anyone.
Children and novices can start with simpler versions, like 4x4 sudoku, which only uses numbers 1 to 4.
4x4 Puzzles >>
Regular (9 x 9) sudoku is not hard to learn. In most cases one can both learn the rules and start solving easy puzzles in a matter of a minute or two.
There are puzzles that can be very difficult to solve. Sudoku comes in different skill levels from very easy to expert (the expert levels are often labeled diabolical, extreme, fiendish, etc.). There are even puzzles that can be too difficult for humans to do. But the easier ones don’t require degrees in rocket science or brain surgery.
The fact that there are very hard puzzles should not alarm or frighten anyone away from this fun game. There are lots of easy, medium and hard puzzles everywhere that can be easy and fun. And as skills are acquired the challenging ones don't seem so hard either.
Sudoku - the puzzle that addicts